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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98503aefeaa41a4af8998f06700ad8d99a6343b13f6979b502335ba6613e99ba' 
  AND token = 'ApAV+dj8rTtZqzRd4DfqmYv24K8B3d86Om9hCjBBR2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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