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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cce7c3664d507acc50cd96045119ed800927d100ee249d4dad81a2cce2bdf5' 
  AND token = 'kwjPhGyfYAHKT2cBfKV6jrAu3TMx1JSXZ9RtbGRYrYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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