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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4009687185bbf2b5c3a7d0fde1e3d48a5d9af1f18316910f705436a4c7f4f7cb' 
  AND token = 'bnSNlMjn3WuJiMGcCupuBWC3OKse86e/XpnG26UxZ/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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