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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6e42986b3563dae280c3feef840e7e5ca447effdd0dfb3e354d79d21f47e02' 
  AND token = 'Mor8+sogBLDzCJJ6BXlaU8pVMt1VDbfCV6HHe+7lHg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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