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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c9f3c38b7db7ad34b90b08b37377f030c09c763c1d28eaa08f3a9cb7ac8bf3' 
  AND token = 'MQTMe8NDYTdka3m6xQ7k0SRobUXQ0wqe3wZwIQ4ZD4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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