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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a633990cb315d4655f5a0514c3bb3128ba9b0b976be52ddcd9071798704f8e97' 
  AND token = 'Xy1HcTlgsS8lWDDJG0VS9BdTjLzF49Syc2DhtmStnLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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