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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79358dae4ba48bd4f310cf88edc69ec5dbef113e0752fb81912613b4624b696f' 
  AND token = 'II9pEUemaRwenyzTg/beTfuQ8odn529f/BrFgnYVUWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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