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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deba1335e5da417c0b86be572fc1d253ac3c87e82ad56e41197e846b3b619c10' 
  AND token = 'YkasvKJ1X3EPbcKePsXRpHhuxK5vFVGfbiNGNIUZTFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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