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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfec9d181ac6711a54502b4fd46bf07095cfb8fce98206a4ed3ba4afa891e701' 
  AND token = 'BoST4TEaa1K1qFjuR/h+HffxUmUYoBVofOLZjSYBcdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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