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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0740717352319553af81eb77e5c7916f2636d3ca96e97930f4d16ab59891ea27' 
  AND token = 'CDRDj16uneKDjwiSFq4mOUsbPLJZ3PKSn1DdJz0RANk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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