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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400095c99d956e2e452b79a2e492670d10112ade8f9e016f4a4ca503d67ba63e' 
  AND token = 'oy0DKK2p+N7PGpkcSq6aJAi5/9qeqa+7bphvVI6wXg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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