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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b48a0cdf9e1c1578dc32d6d2f8aa9b6eee40a2b4250ac00ba8ee64219f10d07' 
  AND token = 'lkmCkYusd1pgNaKvE2EbU6kexeu5YD5rP5r9nZssuHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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