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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1773e0d5549fa6f942eed7feec29912ce513ad8d137aa35260d64819fcd8ab41' 
  AND token = 'kNblqKf7+zJx8fI1m/rhGuLCv1cRvBZHHoxal9ed87s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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