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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd328de3e95b8a4f38046b5d537fa6759f048b104f8f35e77cf73c286a96f5941' 
  AND token = 'j/UkYfOI1Sw+cJdeSYsL9z/L2Uy0rjQT7Kbyn6Jb8Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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