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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03c128c56c742beac85dfe4c44553e5bcc236d8d71443a0722ef16bf275fb6b' 
  AND token = 'u1XdUJUz/xpKR8Mf3KYpe08HJnogRMH4wbdqAybnCsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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