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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c142ec4639eaf98c482e4fbbb54be05aee35edc59e2b5401dbadbe8de055ab4' 
  AND token = 'yf2WXVAl0w5xPROeF7Exw5VEdm2YASe7Zvy3bYs3KOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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