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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b527c6c8432b31b50018955bdc6b6a1188e8443c5d4a4356439f29b807897e' 
  AND token = 'yJc472XZoDI5FSayRJJ8cNjRDcpl9vl6Cpcvh464gb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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