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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5614030f1a4558d2e9e2a5150d6d639e3975626ac74e16960ee5ce2617ddfba6' 
  AND token = 'ZlMzxu2F0QJSMpMXjDH4V0alfsfO5URSkluw0iSe198=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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