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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79d52ddbdae3cb330eee12996b2b8f13d0a344ad611e45fb1b269352dc6ed2f' 
  AND token = 'RCZuEDFsV8DBEZrT7dT6crqXElrAwcLpemU8AHPrRnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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