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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93351d5c56ebf9fc0e889ce1a758584f9463e16bc001e968d0cd99d2ae7250df' 
  AND token = 'RsynLyBBYow0L+57LCW8NLJ8eyOqJ2rBKPInDRa1YPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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