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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e6f144b5d781fa9a1e4466d54e224d40b5b5659c9af0046edf7fc97de88a4a' 
  AND token = 'eWiYIYcs4ZPFq8P5v4+fDPwTYbTpjEgM4Yaq3oe6Bo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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