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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5cca9d206c4a19e55a1c87f2fa1a30f449ac18729dfb45fdda56e500e664d6' 
  AND token = 'PT4KUTbXUeD5eRQPHg56wcrhP1BvBbnmxutzS5Ff22Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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