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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00164a85bab7df03bab4e5182c8075ac9b851cf055ab7fca8d6575eccd4e1415' 
  AND token = '6Fjec83sNzunk+MvrkLPCfYfmSH7KWPZQ8+C3JAIHq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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