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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b2a8f7bf9e9488cf85c40d8794117b0ef77c656f3ab72becb40135f63aba21' 
  AND token = 'd9+MsodH1XJn5CWyIISj3kIn8VaalJDDON8TTyMREuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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