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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbb608d0f530d8e00514947f71e17cfc1617e3590abde4a44974eb35a678a74' 
  AND token = '9zxnVKFkzm49VU/c6Ro2tcv9lfZlA43AZKpfozr2KsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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