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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89df891e9429fbb3be823b22ed793554350ce385e2ee271ad1f79293e0b320b3' 
  AND token = 'RF95poO2kfGCst7t6jE5RfYFVcpe9p/WhjCzGlNU4Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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