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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf731d482da6d19a61e01622e653abd62bc7628c181ff5f3d286a9f3f1c9c25' 
  AND token = '9hieEyLxeYLbZSx+/XpCTX1isnvi67wtq49taBF8tbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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