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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1a5cbfa8445a7def7c3b81e061d7d19c61f16d6e3f0691569a5f7234f1fcdb' 
  AND token = 'nQF1KoV+3Jv059iptlOH4zOjMyKqu1N3giHyobkvfhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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