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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9c3e32f4ccaf5610f35a32bad2590668279f74106f57524ef82b03cb361332' 
  AND token = 'd4D/FSU5d7zFBXc83H8qH4CPBDByIJm5GG84WxTsFpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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