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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90650e20d35e78abe8ebae578e4019a8864aa99b85d3a02e45a0975fdaf5bc8e' 
  AND token = 'jvhC3XAApyAz9h/vL22B8J6Dl3zhW1QWPLgv6pxFw3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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