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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2b62e19d404482282db5c1f84e6e8acde3ee61e22cfc3dfd8d5f2f340a15ae' 
  AND token = '3RNgne39dluuRJqqoyJOoapmN8ErTUHN0S6eRoGObyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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