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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5d3336cb84ccc518142f114c71a824948c25cc242dd0072fa0c1f83d2c53db' 
  AND token = 'bM+VJpOHJ5iz6T/m1LYLiV9FO1r7xIeckm1bZtTk6XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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