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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c708850c9c1f7474b36c069ba69e3db6192e73eb68ccc55d48e1601dd0a6b8f3' 
  AND token = 'ToVuWGnqSlsWWzvt014O11mDRQSRzZWfuHUBgt5su4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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