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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e03cfdb1022e5c1dd85fba86ab93e1695fe8f230456e945bde052c8d99d8e0d' 
  AND token = '6RvCpCFAlkn8C39RzMWA8MSi/rEifz0FIiqLKK79fKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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