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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89471980eb02a958976427f8eb43524eb7d414f01dfcea515be41145399c422' 
  AND token = '3spjyQ1G2LtkUUxfLIhPw63i/OCM6RKmchqRHiz68ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}