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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bfffe4ed8b8d9de33cc122fc7d799b4f351da35756534fc18abbb204dd0a0a' 
  AND token = '/n17qYgn30ZVY2cH9iqP/dTJmdi5TelxXUCyI/wD99o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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