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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259773262b134787aa3b9a92bd9c6aed25a4d14efbc7ae2bb9f86a2864338a62' 
  AND token = 'FMAADzNZBP+ut75Kb58loLbrzggc9G0dPKJr5cEudtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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