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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98eec332d4e25149ca633dd89e74cd8ff4e852ec7940c42f7f872f807b1df333' 
  AND token = 'bO/7ht3cIjSN4CqpXaIftrrRcwjQ4Kny2gAX1rTzbpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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