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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71020ae39ef1d7438d43e1beb958b1b112c0b256330885b1656bcbc8c899f55e' 
  AND token = 'HG+4hmI8QyjX8Ut1fQTP+i+zMR+5uTxy/h5gITmpymY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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