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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2cbaa82c8f4738daf757dddd8f32a98b045bfacaaee2a0d4ec3d70e826eb5d' 
  AND token = 'jNBf3riPkFLK4KPoC4DZL7JB0dMaZ72iQUBkFgwyUWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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