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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a39f74ebe1c5113c2496dc9c54267f732bdc14ad38eaa160bd48c33db52042' 
  AND token = 'iSZsHv880nr4+C6xblKERIElsMNBkex21BkmZhgQFvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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