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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675ae1dda8e875719bfcd084afd5df63e47a1a588d5d702abade9a1e3863b4d2' 
  AND token = '7SDhyuw1EERI4DRotq8EnXklZM/Tn7YRCz93HbeknIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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