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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c516a06d530cb82b72c988ebb359133eca199662f3f95a539038fc021c054d' 
  AND token = 'yU1WnaUULFR8+4BOoc73TZ1/0pF+pcz/25GgzlEqxSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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