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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9655925559845349314fa1526ef1efdf75d41e6bb4c99482cb51889e95904de' 
  AND token = 'uqPSZD3YrCfNaGb6tpUqJ2/VPoYNb9B1m7IYDiloizY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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