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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57919de6aa0d1aeaec28b3268839aafcd0092d13ea5ac70153105fbc625c753d' 
  AND token = 'tR9NlX2m2pHZtQpCdzZ07dIakvZPoINOvdZ/5GS/CtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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