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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e061f03ae350b30efebe1c1bcf5a1cfb72a5b16b0fab39d86ba045efa2cc4f7' 
  AND token = 'PLBVvQmEojmRrsR6DF+BxtZZNfk7GVOArIkyebceBmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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