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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db578377d7278374d57c99ba777ba01342855857d53c00de22984a4a04aa37be' 
  AND token = 'QDCA4zWFG0BqYle6hGUReloNO5riiaC5rkfhNfkevhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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