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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c312847b56afe4b6e4e628eda5d9c1f808102bd45fd03a752ffaba2206cd0c6b' 
  AND token = 'm8MG9GWgqC6xaYlcq4FkWVpo6mrpRj07K8/6UxMzOkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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