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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa20648ee41de144c2e3b035618d4c6a9bac9bacd810a3b1168832cee32dd9b' 
  AND token = 'S97GX7wxi/bFRaN4Wu2E5HOib5HJfRFWXBGxfEHvalw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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