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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9af0bdcc8947c6dcefe0ce1813db6bde2c81e168db5e173bffd14e20158aa39' 
  AND token = '4mDfmOeuKDIm5UnD+u9JlLgJ4AxaqEVTbCYY32Z3xxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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