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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b39bee462d04857f52d4c6cae32e3478048ba41f40e43c50ce2f929592f7f4' 
  AND token = 'Yqy+aHB8DVpjj974TU8jA8x6EpWgDefKiYUZbm1U6mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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