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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f71811be0cac22df12e648c88d82349b858c5071bc9cc988197efb1f315064' 
  AND token = 'nH4ODt9DFhxi7i/B5kVcpcyyGdWe5wg5PMgJiR2Tk/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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