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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e36f940d56d824ddf90430818a29de0ea5bc570122d09d16cff7938aff8970' 
  AND token = 'jG48p30i3MolzTwti8ZYC5+J5IAmAgqI/nDbtpra4DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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