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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bdf8f17bb411fd556998116664813831cc7369058f72259d70527c279f0761' 
  AND token = 'jqLyTUp00hkyjhWbi8d16n3e3N6E1hCj0yFPl8cj2r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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