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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57909843a11c6dd6f039c9c0c5583969a6a7d20380e20ca4f79b9a3b0a6fcc1' 
  AND token = 'SODINwLVoQvZ0y2ZXDKErEDiYP+cIqKWh46eqEJ0IlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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