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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3363ab42c8334b1e6043a465f74777f533f6923a88bcafa8f7733b6978fffde8' 
  AND token = 'wjKFtlb8K1q1n088R59Oax+KJu/M4eHltmcfMm64Gjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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