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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8af97c0f416d8405c514f41673147a0491743d45eb096a010a15c4792809c0' 
  AND token = 'DMhYqwWRH5TRepr8S6QjRyApU8/mNJHh+28hjgnZ+x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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