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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8cf95fa6d185571ec956e542be7e829f396e7b436b58b0c080090da27142e91' 
  AND token = 'lYin18sqG7x5bezYY04OznvYFtx4ROO4bidMlCiWdA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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