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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075ce1414c81c5114cbdcb35bc20a89464d9bbd4113fe73348573fb64aace37a' 
  AND token = 'AlJeA6/gh7eBL9DLNpZOqnxVHgslL7dCN4d1B1CTnb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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