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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0441810ab35dc6c90dcff3f174acc0ea5972d99b71b9568c969914f5ba8f1a' 
  AND token = 'ReBQIXzhOhSaQnl0PYyDfcyN/URPWXx/hk8C8tBFeTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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