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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c55db5fdf8fcbdce3315a8919becd9bf118ad764f77abbe5add409bfe935ae' 
  AND token = 'q1J+nI3sspRpF2/HSqeo+t24Y9c68DkWNAdEEbNQzVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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