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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4ae9c2bc1abaef047ca1f7f948c0fb97587f3dabc1a54a153fead55887360a' 
  AND token = 'RN19gHT2HJTiqi00FcfkVSDDb3CLfWpmKnyRsC8+j7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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