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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f8e2af5781b9b51464acead3246b90d5d03dd023d9050d8a695dbc3db3cfe0' 
  AND token = 'rp2GwW/ZRoByw+lOh56Kuwpxh+yVOXDv+My0rSdJa8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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